Similarities and differences between electrodialysis and ion exchange
Thread Content
Electrodialysis is a new type of separation technology that was developed in the 1950s. Its main device is an electrodialyzer. In the electrodialyzer, many anion membranes and cation membranes are arranged alternately, dividing it into small water chambers. When the raw water enters these chambers, under the influence of a direct current electric field, the ions in the solution migrate in a directed manner. A cation membrane allows only cations to pass through while retaining anions; a anion membrane allows only anions to pass through while retaining cations. As a result, part of these chambers becomes a fresh water chamber with few ions, and the output water is referred to as fresh water. The small chamber adjacent to the fresh water chamber becomes a concentrated water chamber where a large number of ions accumulate, and the outlet water is referred to as concentrated water. This enables the ions to be separated and concentrated, thereby purifying the water. Laitlead Shanghai Water Treatment Equipment Company www.shanghaishui.com Compared to ion exchange, electrodialysis has the following similarities and differences: First of all, although both use ion exchange resin as the medium for separating ions, in electrodialysis it is in the form of thin films, whereas in ion exchange it appears as spherical particles. Secondly, in terms of the mechanism of action, ion exchange is a type of ion transfer and substitution, with the ion exchange resin undergoing ion exchange reactions during this process. Electrodialysis belongs to ion retention and displacement; the ion exchange membrane plays a role in selective ion permeation and blocking during this process. So, more precisely, ion exchange membranes should be called ion-selective permeable membranes. Third, the working medium in electrodialysis does not require regeneration, but it consumes electrical energy; whereas the working medium in ion exchange must be regenerated, but it does not consume electrical energy.
:lol:lol:lol:lol
:D:D:D:D:D:D:D:D
Compared to ion exchange, electrodialysis has the following similarities and differences: First, although both use ion exchange resin as the medium for separating ions, the former uses sheet-like membranes while the latter uses spherical particles. Secondly, in terms of the mechanism of action, ion exchange is a type of ion transfer and substitution, with the ion exchange resin undergoing ion exchange reactions during this process. Electrodialysis belongs to ion retention and displacement; the ion exchange membrane plays a role in selective ion permeation and blocking during this process. So, more precisely, ion exchange membranes should be called ion-selective permeable membranes. Third, the working medium in electrodialysis does not require regeneration, but it consumes electrical energy; whereas the working medium in ion exchange must be regenerated, but it does not consume electrical energy.